[RebelBanker]

As per Robert A. Heinlein,
Coffee comes in five grades: Coffee, Java, Jamoke, Joe and Carbon Remover.

Yes, as a matter of face I have used coffee to clean the breech block on my Sharps rifle...

[50sDad]

Ever read Niven's "Mote in God's Eye"? I re-read that one yearly...the discussion in here reminds me of Horace Bury's "educating" the navy spaceship crew about coffee. To them, it was black and helped you make it through the shift. To him, a thousand delights. (Although, I would love one of the Watchmaker-designed coffee pots, which bleeds all oils and contamination to the outside of the pot, leaving only pure coffee within...)